package com.jthink.security.code.img;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import com.jthink.security.code.ImageCode;
import com.jthink.security.code.ValidateCode;
import com.jthink.security.code.ValidateCodeGenerator;

public class ImageCodeGenerator implements ValidateCodeGenerator {

	@Override
	public ValidateCode createCode() {
		int width = 148; // 验证码图片宽度
		int height = 40; // 验证码图片长度
		int length = 4; // 验证码位数
		int expireIn = 60; // 验证码有效时间
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

		Graphics g = image.getGraphics();
		Random random = new Random();

		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		g.setFont(new Font("Times New Roman", Font.ITALIC, 38));
		g.setColor(getRandColor(150, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(250);
			int yl = random.nextInt(250);
			g.drawLine(x, y, x + xl, y + yl);
		}

		StringBuilder sRand = new StringBuilder();
		for (int i = 0; i < length; i++) {
			String rand = String.valueOf(random.nextInt(10));
			sRand.append(rand);
			g.setColor(new Color(10 + random.nextInt(110), 10 + random.nextInt(110), 10 + random.nextInt(110)));
			g.drawString(rand, 18 * i + 12, 32);
		}
		g.dispose();
		return new ImageCode(image, sRand.toString(), expireIn);
	}

	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}